$10$B$\mathrm{.}2\mathrm{.}2$ Read the following three statements:

a$)$ Modelling is a common method used for analysing a system and worpentey decision$-$making of persons during the design and operational phrtunt if system's life cycle.

b$)$ The purpose of modelling is to understand, predict, control and, Utrmitst improve. True